The effect of acute evoked muscular pain at the lower back on motion capture and surface EMG during a repetitive movement task

The effect of acute evoked muscular pain at the lower back on motion capture and surface EMG during a repetitive movement task

by Franziska Butterwegge
Doctoral thesis
Date of Examination:2022-06-09
Date of issue:2022-05-24
Advisor:Prof. Dr. Frank Petzke
Referee:Prof. Dr. Frank Petzke
Referee:Prof. Dr. Martin Sommer
Referee:Prof. Dr. Thomas Meyer
Persistent Address: http://dx.doi.org/10.53846/goediss-9266

 

 

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Abstract

English

Low back pain (LBP) is one of the most common reasons for consulting health care services. Since up to 80% of all people experience LBP at least once in their lifetime, it is of great interest to understand the underlying processes. This study investigated the effects occuring during experimental acute pain. Therefor 26 healthy individuals were asked to fulfil a repetitive lifting task. One trial was performed under acute back pain, provoked by an injection of hypertonic saline into the lumbar errector spinae muscle. The muscle activity was measured with high density surface EMG over both lumbar Mm. errector spinae. The movement was analysed with motion capture systems. Moreover, the pressure pain threshold (PTT) was examined at the very beginning and after every trial. It turned out, that repetivite movement as well as acute LBP lead to an increase in PPT. It was noticed that the muscle activity decreased in the painful region after the hypertonic solution had been injected, whereas the centre of activitiy was still as flexible as in non-painful condition. Additionally, pain did not have any significant effect on the motion. Combining the information of EMG and motion capture it turnes out that in painful condition there was a decreased electromechanical delay due to muscle stiffnening. Despite of some similarities, it can be concluded, that acute muscle pain differs from chronic pain in various aspects.
Keywords: low back pain
 
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